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Finding the Fourth Proportional to 403.05, 552.75 and 386.43

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Solution

The fourth proportional to 403.05, 552.75 and 386.43 is: 529.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.05 : 552.75 = 386.43 : x
  2. Step 2: Convert to fraction form
    403.05/552.75 = 386.43/x
  3. Step 3: Cross multiply
    403.05x = 552.75 × 386.43
  4. Step 4: Simplify right side
    403.05x = 213,599.18
  5. Step 5: Solve for x
    x = 213,599.18/403.05
  6. Step 6: Final answer
    x = 529.96

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.